Crossword Genius

Supporting actors, the French king moves (7)

Ross

I believe the answer is:

castles

I'm a little stuck... Click here to teach me more about this clue!

'king moves' is the definition.
'castles' can be an answer for 'moves' (castle is a kind of move). I'm not sure about the 'king' bit.

'supporting actors the french' is the wordplay.
'supporting' is a charade indicator (letters next to each other) (in a down clue, some letters go under others).
'actors' becomes 'cast' (I've seen this before).
'the french' becomes 'les' (les is the in french).
'cast'+'les' is 'CASTLES'.

Can you help me to learn more?

(Other definitions for castles that I've seen before include "Men" , "big houses" , "Large and stately mansions" , "Rooks" , "Don't build the chess pieces in the air" .)

I've seen this clue in The Guardian.
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